1102845721 has 2 divisors, whose sum is σ = 1102845722. Its totient is φ = 1102845720.

The previous prime is 1102845713. The next prime is 1102845749. The reversal of 1102845721 is 1275482011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 750157321 + 352688400 = 27389^2 + 18780^2 .

It is a cyclic number.

It is not a de Polignac number, because 1102845721 - 2³ = 1102845713 is a prime.

It is not a weakly prime, because it can be changed into another prime (1102845781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 551422860 + 551422861.

It is an arithmetic number, because the mean of its divisors is an integer number (551422861).

Almost surely, 2^1102845721 is an apocalyptic number.

It is an amenable number.

1102845721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1102845721 is an equidigital number, since it uses as much as digits as its factorization.

1102845721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 1102845721 is about 33209.1210513016. The cubic root of 1102845721 is about 1033.1695250455.

The spelling of 1102845721 in words is "one billion, one hundred two million, eight hundred forty-five thousand, seven hundred twenty-one".